Refining-engine for paper-pulp.



PATBNTED JUNE M. A. MILLS. REFININ'G ENGINE FOR PAPER PULP.

APPLICATION FILED APR. 15, 1902.

6 SHEBTS-SHEET 1.

No MODEL.

m: Noam uanus'co. Puma-L NG,

PATENTED JUNE 2, 1903.

M. A". MILLS. REFINING ENGINE FOR PAPER PULP.

APPLICATION FILED APRPIB, 1902.

8 SHEETS-SHEET 2.

I no MODEL.

31114111614. wezzzz'ragzyzilzfi.

PATENTE'D JUNE-2, 1903.v

'M. A. MILLS. REFININGBNGINE FOR PAPER PULP.

APPLIGATION FILED Aili lfi, 190,2.

KO MODEL.

v Q QR PATENTED JUNE 2, 1903'.

A. MILLS-.1

REFINl-NG ENGINE FOR PAPER PULP. LPPLIQATION FILED APR. 15, 1902.

I0 MODEL 9 8 SHEETSSHEEI.4J

No. 729,953. I PATEN'IBD JUNE'2,19O3. I M. A; MILLS. P

REPINING ENGINEPOR PAPER PULP. Arrmolnon rum) An. 15, 1902.

N0 MODEL. 6 SHEETS-EXPECT 5. k

5 1 1 will" PATBNTED JUNE 2; 1903'.-

I M.'A.'MILLS. J k Q REFINI'NGBNGINE FOR PAPER PULP.

APPL IGATI ON I IL ED APR. 16, 1902'.

l/fz 4 n4: Noam was :0 mummwa, WASNINETGN, n r

MELVIN Aiinnosii-ivirnns Patented June 2, 19055.

'I'Q'TFFICAE;

PATENI .smwsemt, MASSACHUSETTS.

Fen mean u LP.

srncxmoArrro vf i ingpart ,oi 'Let ter s liatent No. 729,953, dated June2, 1903.

ing at Lawrence, in thecountybf qEssex an fd:

State of Massachusetts;have-"invented cei'fi tain new and usefulImprovements in'Refi'n-i ing-Engines for Paper-Pulp, of which thefollowing is a specification.

This invention relates to paper-mill machinery, and mumi-an or the typecommonly known in the art, especially among paper manufacturers, ,as *Jordan or refining engines. A Machines-or engines of this class providefor a treatment of the paper stuff or pulp usually just before it passesto the paper-making machine and secures such a grinding or macerationthereof as to place the same in the best possible condition for themaking of the paper.

Other purposes and advantages of Jordan or refining engines are quitefamiliar to those versed in the art, andwhile. all of these purposes andadvantages are preserved by'the present invention still .a specialobject of the latter is to efiect a general improvement of the entiremachine in order to increase its efficiency besides overcoming some ofthe objectionable features incident" to the use thereof. 7 i i As iswellknovvn, a Jordan or refining engine for paper-pulp isusually quiteheavy, besides being of comparatively large size and requiring aconsiderable amount of power to run the same effectively. It is one ofthe primary objects of the present invention to provide an improvedconstruction of refining or Jordan engine involving a distinctimprovement in each of the particulars specified without afiecting theutility of the machine in either its treatment of the stock or in itscapacity to handle the same quantity as the larger-sized machines now.in general use. p U

Tothis end the invention has in'view certain-important, improvementswhich permit of the engine being made of a comparatively small size,much smaller, in fact, than any of the ordinary types of Jordan orrefining engines now on the market. While providing for an engine of aminimum size, the invention at the same time comprehends a Structurecapable of being operated with a much (llo model.)

lessz'expenditure o f-power than ordinarily, and yetgwithoutsacrificingany of its capac-' ityor proper refining action upon the stock.

Among other objects in view is to provide a novel arrangement ofbearings which not only provide :for the, running of the engine with-"aminimum amount of friction, but at the same time permitting of theendwise movement or adjustment of the plug-shaft. In this connection theinvention also contemplates a distinct and important improvement in themounting of the driving gear or pulley. i

' In connection with the novel mounting of the driving gear or pulleytheinvention has in viewthe employ ir'ient of a bearing-hanger for thepulley itself, which bearing-hanger comprises means.for holding thepulley to rotation in a fi nedplanfe, or, in other words,- relativelystationary Withg espect tothe endwise or longitudinal adjustment of theplug- Shaft, thusinsuring'ithe keeping of: the pulley in lisnegwith thebelt at; all. times. and under all adjustments of the machine;

A further object of the bearing-hanger for the pulley isto provide meansfor'entirely relieving'thesame from ffriction incident to a sidepressure pr thrpst in either direction. In other words, the -inve ntioncontemplates a thrust bea'ring mounting for the driving-pulley itselfwhich provides forfthe-proper support or m oun-ting ofthe pulley forrotation in a fixed planejwithout employmentof quills,

have heretofore been resorted to in the mounting of the driving-gear fora Jordan engine wherein the pulley was relatively fixed'or stationary.

Another object of the invention is to provide an improvement in themounting of the driving-gear wherein a bearing iisdi's pensed withbetween the pulley-tandr-the adjacent end of the Jordan shellQand' anadjustable hearing-stand is employed which permits the belt to be drawnfrom any directi0n, s0 that v the engine may be adapted to any space orbelting, while at the same time the belt may be removed without cuttingor unlacing the same or without disturbing the mounting of thedriving-pulley. l i The invention also has for-its object an improvement in the :formation'of the plug -to stand.

driving -pulley.

present less obstruction to the forward movement of the stock, while atthe same time insuring a more perfect and constant balancing than ispossible with the old type of hollow Jordan plugs.

A still further object resides in novel means for effecting the endwiseor longitudinal adjustment of the plug and in the general formation ofthe' engine which permits of the employment of a short base.

With these and many other objects in view, which will more readilyappear as the nature of the invention is better understood, the sameconsists in the novel construction, combination, and arrangement ofparts to be hereinafter more fully described, illustrated, and claimed.

The essential features of the invention are necessarily susceptible to awide range of modification from a structural standpoint; buta few of thepreferred embodiments thereof are shown in the accompanying drawings, inwhich'* Figure 1 is a side elevation of a refining or Jordan engineconstructed in accordance with the present invention. Fig. 2 is an endview of the engine, showing more plainly the mount-ing of thecircularly-adjustable beltaccommodating bearing-stand. Fig. 3 is avertical longitudinal sectional view of the entire machine. Fig. l is anenlarged detail sectional view showing the preferred construction ofthrustbearing hanger for the Figs. 5 and U are similar views showingmodified types of thrust-bearing hangers which may be resorted to in themounting of the pulley upon the bearing- Fig. 7 is a detail sectionalview illustrative of a modification which maybe resorted to in thecharacter of bearing employed for receiving the outer extremity orterminal of the plug-shaft at the driven end thereof. Fig. 8 is anenlarged detail sectional view showinga preferred form of duplex ordouble acting thrust-bearing utilized in connection with the end of theplug-shaft opposite the driving-gear and adjustable through the mediumof adjusting mechanism to effect the longitudinal or endwise adjustmentof the plug within the shell. Fig. 0 is a detail end view of theadjustable double-acting thrustbearing shown in Fig. 8 and illustratingsaid bearing arranged within the stationary guide therefor. Fig. 10 is adetail end view of the plug-shaft, showing more plainly the keyed orfeathered connection thereof with the wearbushing cooperating with theshaft-bearing at the driven end thereof. Fig. 11 isadetail sectionalview illustrative of another modification that may be resorted to in themounting or hanging of the pulley upon the bearing-stand or otherstationary support. Fig. 12 is an end view similar to Fig. 2, showing amodification in the construction of the cir-' cularly-adjustablebelt-accommodating bearing-stand. Fig. 13 is a detail sectional View onthe line 1 1 of Fi 8, showing a form of indicating device that may beutilized with the adjusting-screw for the plug-shaft. Fig. 14: is asimilar view on the line w as of Fi 8, showing a form of fastening orlocking device that may be utilized for locking the plug against endwisemovement after having been set to its adjusted position.

Like reference characters designate corresponding parts throughout theseveral figures of the drawings.

In carrying out the present invention the general form of the ordinarytype of refining or Jordan engine is preserved; but the important anddistinctive differences reside in the construction and arrangement ofparts which permit of the engine being made much smaller than usual andrequiring less power to run the same without sacrificing any of itsefficiency either in its refining action or as to capacity. Consequentlythe approved form of Jordan or refining engine may be preserved inutilizing the improvements contem plated by the present invention,though it should be understood that these improvements are equallyapplicable to any preferred or practical shape or design of shell andplug. However, for illustrative purposes it has been deemed preferableto show the distinctive improvements contemplated by the invention inconnection with a Jordan shell and a plug of the type disclosed in myformer patent, No. 481,605, and also in my pending application, SerialNo. 57,080, filed April 23, 1901. Specific reference to the improvementswill therefore be made in connection with the form of Jordan shell andplug shown in the drawings.

Referring particularly to the drawings, the numeral 1 designates theexterior tapering shell of the engine. This tapering shell issubstantially of a frusto-conical form and in the present invention isdesigned to be made of materially less diameter and length than theshells of the larger-sized Jordans now in use. However, no substantialchange need be made in the filling of either the shell or the rotatingplug 2, working therein. In the drawings the shell 1 is illustrated asbeing provided upon its interior surface with a series oflongitudinallyarranged knives or blades 3, with which cooperate thesimilarlyarranged knives or blades 4, carried by the rotating plug 2.The knives or blades 4, carried on the periphery of the rotating plug 2,work in proximal relation to the opposing edges of the stationary knivesor blades 3, fitted to and within the shell 1 to effect agrinding ormaceration of the pulp as it passes through the machine, thus securingthe refining action which is contemplated by a Jordan or refiningengine. The rotating plug 2 is also of tapering or conical formcorresponding to the configuration of the shell within which it works,but is necessarily smaller in diameter than the shell to provide anintervening working space between the exterior of the plug and the innerwall of the shell,

which space is practically occupied by the complemental and opposingknives of both the shell and the plug in order that the proper whichfrequently flow withv the pulp into the engine and are liable to damagethe knives on the plug or its inclosing shell. The said annular chamberor trap 5 at the receiving end of the engine also has usually extendedtherefrom a pendent auxiliary trap or pocket 6, into which the foreignsubstances fall from the chamber 5 and may be readily removed from timeto time through a suitably-covered opening or openings formed in theside or sides or the said trap or pocket.

At the same end as the annular trap or chamber 5 the shell of the engineis also provided with the receiving-hopper 7 for the paper pulp or stuffto be treated, and in carrying out the present invention the end wall ofthe shell at the receiving end of the engine (which wall may be eitherseparate or an integral part of the shell) is provided with a flangedopening 8, surrounded by an exterior annular supporting-flange 9, whichwill be hereinafter more fully referred to in connection with themounting of the different elements of the driving-gear at the driven endof the plug-shaft.

At the end opposite the wall having the' flanged opening 8 the shell 1has bolted or otherwise suitably fitted thereto an offset chambered head10, which is offset from the wide end of the shell beyond thecorrespondingly wide end of the plug to constitute a discharge ordelivery chamber which permits of the ready discharge of the refinedpaper-stuff through the outlet pipe or opening 11in communication withthe interior chamberof the said head 10. The latter is also preferablyequipped with a central stuffing-box 12 for receiving the portion of theplug-shaft 13 which projects through and beyond the dis charging end ofthe engine.

The body of the shell is designed to be supported horizontally over anysuitable base B through the medium of suitable supporting standards oruprights 14, arising from the base and having the shell resting on andsecured thereto in any of the approved ways common to the mounting ofJordan or refinin g engines. These details are not important to thepresent invention and may be varied in any way without departing, fromthe spirit.

or scope thereof. a

The construction so far .described, with the exception of the provisionof the flanged openthe shell in the ordinary way, while at the same timepermitting of an endwise or longitudinal adjustment thereof tocompensate for the wear of the knives or blades, as well as to providefor setting the knives of the plug and 0f the shell as closely as may bedesired,;

according to the particularcharacter of stock being treated. However, inthe ,fi'rst place the present invention contemplates making the rotatingplug 2 much smaller both as to diameter and length than the ordinarytypesof plugsnow in use, thus, admitting of the plug being rotated witha much less expenditure of power, and yet'at the same time at-asufficient speed to maintain the full capacity of a Jordan engine ofmuch larger size. This improvement, while relating particularly to thesize of the plug, is an important one, but yet is only possible throughthe medium of associating with the plug the various other improvementscontemplated by the invention.

A very distinct improvement inthe rotating plug of the Jordanresides inthe fact that it is the purpose of the present invention to form saidplug of a solid casting or forging, as plainly shown in Fig. of thedrawings. The solid plug-casting may be either cast on or with the shaft13; but in either event the advantage is derived of having a rotatingplug which will alwaysremain in perfect balance. Heretofore it vhas beencustomary to form the plugs of hollow castings; but these hollowcastings are open to the objection of leaking and I becoming partiallyfilled with stock and water, which necessarily have the tendency tothrow the plug out of balance. This of course is very undesirable inmachinery of this character, and a solid plug-casting obviates thedifliculty.

In the construction of the plug 2 the same is formed upon its'peripherywith a succesblades 4, and these holding-collars preferably constitutean integral part of the plug-casting, and in connectionwith the latteritshould further be observed'that at its smaller endthe conical ortapering plug 2 is provided with a contracted guiding-incline 16, whichmerges on curved lines directly into the contiguous portion of theplug-shaft 13,1thusentirely eliminating the feature of an abutment,shoulder, or obstruction at the smaller end of the Jordan plug. v.

In the ordinary types of Jordan engines there is usually a well-definedand distinctshoulder orihead at the smaller end of the plug,whichnecessarily presents an obstruction more or less to the ready flowof pulp as it passes from the receiving-chamber of the shell into theworking space occupied by the knives 3and 4-. The guiding-inclinelGoffers no such obstruction to the ingoing stock and permits the latterto easily and uniformly flow into and through the working space occupiedby the knives, respectively, of the rotating plug and the stationaryshell.

The plug-shaft 13 projects from both ends of the solid plug-casting andextends through and beyond the opposite ends of the stationary shell 1in the usual manner to provide for holding the plug properly centeredwithin its shell and at the same time permitting of the directapplication of power to the shaft, also to permit of the convenientlongitudinal or endwise adjustment thereof to eflt'ect the properadjustment of the plug. It is preferable in the carrying out of theinvention to lit over the opposite portions of the plug-shaft,respectively, beyond the opposite ends of the plug protective brass orequivalent shaft-sleeves 17. They provide better bearing-surfaces forthe shaft, especially at the points where the same projects through theend walls of the shell, while also protecting the shaft portions fromthe corrosive influences of the liquid mass being treated in the engine.The said brass or equivalent shaft-sleeves 17 may be shrunk or otherwisesuitably fitted on the separate shaft portions without affecting theinvention, as the use of said sleeves is optional with the manufacturerof the engine, although it is preferable to employ the same in theconstruction of an engine of the type contemplated by the presentinvention.

At the driven end of the machine or engine the plug-shaft 13 extendsthrough and beyond the stutfing-box 18, carried by the inner side member19 of the rotatable or circularly-adjustable beltaccommodatingbearing-stand 20, said stuffing-box being of the conventionalconstruction, but preferably constituting a part of the rotatable oradjustable bearing-stand 20 and registering within the stuffing-boxopening 8, formed in the adjacent end wall of the plug-shell 1.

The stuffing-box 18 is only one of the structural details of thebearing-stand 20, as the latter performs several important and usefulfunctions in the carrying out of the present invention. The saidbearing-stand is usually and preferably in the form of a circularskeleton frame, essentially consisting of the oppositely-arranged innerand outer side members 19 and 21, respectively, and a plurality ofsubstantially horizontal cross-bars 22, connecting the inner and outerside members 19 and 21 at intervals, thus forming the general frame ofthe stand.

By reason of the skeleton construction of the open bearing-stand 20 theinner and outer side members 19 and 21 thereof are usually of a spokedformation and consist of a series of radially-disposed frame-arms 23,whichare formed integrally with and are connected at their outerextremities by the crossbars 22, previously referred to. \Vhile theinner side frame member 19, through the medium of the cross-bars 22,constitutes a part of the same framework as the outer side member 21, itis preferable in the construction of the bearingstand to provide aseparable or detachable joint connection 24: between the outer ends ofthe frame-arms 23 of the said inner side member 19 and the contiguousinner end portions of the cross-bars 20, as may be plainly seen fromFig. 3 of the drawings. This separable or detachable joint connectionbetween the inner and outer portions of the frame constituting thebearing-stand facilitates the setting up and taking apart of themachine, as will be readily understood by those familiar withmachinebuilding. However, for the purposes of thevpresent invention itshould be understod that the construction described is a complete frameas an entirety and as such is rotatable or circularly adjustable toprovide for accommodating the machine to a belt drawn in any directian,as will be presently explained.

The cross-bars 20, which connect the inner and outer members 19 and 21of the bearingstand injthe manner explained, are preferably curved incross-section to form saddle-plates, which are designed to individuallyrest on and register in the stand-seats 25, located at one end of themachine-base. Preferably a pair of the stand-seats 25 are utilized, andin the construction of the machine the main base 13 is formed with oneof said seats at one extremity thereof, while the other seat is formedat the upper side of a separate baseblock 26, spaced beyond thecontiguous part of the main portion of the base, thus obviating thenecessity of running a full solid base clear out to the point where theouter portion of the rotatable or adjustable bearing-stand has a supporton one of the stand-seats 25. The stand-seats 25 are curved tocorrespond to the cross-sectional form of the saddle-plates orcross-bars 20, and the particular saddle-- plat-e or cross-bar whichrests on and registers in the horizontally-alined pair of stand-seats 25is adapted to be held fast to the base by means of the bolts orequivalent fastening elements 27.

In constructing the rotatable or circularlyadjustable bearing-stand 20one of the importance in the matter of installing a Jordan or refiningengine in a paper-mill where the shafting and belting already occupiespermanent positions, inasmuch as by the employ ment of an adjustablebearing-stand of the character just described the machine can be readilymade to accommodate itself to the direction in which the belt is drawn.

In Fig. 2 of the drawings the open side or belt-opening 28 isillustrated as being'presented at one side to accommodate a drivingbelt29, drawn from what might be termed the right-hand. side of the machine;but should thebelt be drawn from a diametrically opposite direction, orfrom overhead of the machine, it is obvious that it is only necessary torelease the fastenings 27 to provide for rotating orturning thebearing-stand upon its axis, so as to bring the belt opening or space 28into either of the other two positions indicated. After adjustment orsetting to accommodate itself to the direction in which the belt isdrawn the fastenings 27 are replaced and tightened, so that thebearingstand constitutes a rigid part of the supporting-frarnework' forthe driving-gear as well as for the plug-shaft It is of courseunderstood that only a preferable construction of the adjustablebelt-accommodating bearing-stand 20 has been described, as obviouslythis stand may be constructed in various ways and at the same time carryout the functions already indicated. It is only necessary that the saidstand be generally of an open or skeleton formation and circularlyadjustable, besides being provided with an open side for the clearanceand accommodation of the drivingbelt. For instance, one of the variousmodifications which might be resorted to in the construction of thebearing-stand is suggested in Fig. 12 of the'drawings. As shown in thisfigure of the drawings,instead of connecting the radially-disposedframe-arms by a plurality of individual cross-bars 22, as previouslydescribed, which cross-bars constitute separate saddle-plates, thebearin -stand may be constructed with a continuous approximatelysemicircular rim or shell section 22", which extends continuously fromarm to arm of the bearing-stand and practically constitutes a continuoussemicircularsaddle, adapted to be turned in and clamped to thestandseats 25. By reason of the approximately semicircular formation ofthe rim or shell section 22 the latter necessarily provides at one sideof the bearing-stand an open side, beltopening, or belt-clearance space28 to accommodate the driving-belt, The construction just describednecessarily carries out every function of the preferable constructionpreviously described and emphasizes the variety of modifications thatmay be resorted to in the formation of the circularly-adjustablebelt-accommodating bearing-stand.

Various expedients'may be resorted to in the mounting of thebearing-stand 20 to permit of its being rotated or adjusted circularlyupon an axis of rotation. A simple and practical means for effectingthis mounting is shown in the drawings and consists in 'providing theinner side member 19 of the bearing-stand with a central journal portion30, which has a swiveled or pivotal engagement with the adjacent wall ofthe plug-shaft. The said central journal portion 30, carried by theinner side member 19 of the bearing-stand, comprises the stuffing-box18, fitting Within the end opening 8 of the plug-shaft and a shoulderedbearing-collar 31, concentrically arranged with reference to thestufiing-box 18 and loosely interlocking with the supportingflange 9,surrounding the opening 8, thus completing an interlocked swiveledjoint'connection between the inner side of the bearingstand and theadjacent end of the plug-shell, while at the same time providing for theproper support of a stuffing-box at that end of the shell in which theplug-shaft may turn.

The construction described provides a preferable form of swiveled orpivotal joint connection between the inner side of the bearing-stand andthe plug-shell; but it is of course obvious that in carrying out theinvention this joint may be varied Very materially from a mechanical orstructural standpoint withoutdeparting from the invention, as it is onlyessential in carrying'out the latter I hat some suitable type ofswiveled connection be provided between the inner side of thebearing-stand and the plug-shell to permit of the circular adjustment ofthe stand upon a horizontal axis.

The bearing-stand, which is circularly adjustable upon a horizontal axisin the manner explained, by reason of having inner and outer. sidemembers rigidly united provides an exceptionally strong support andbracefor one end of the plug-shell as well as for the driving-gear which isassociated with the said stand, and by'reason of the novel constructionand mounting of the driving-gear the employment ot.a bearing for theplugshaft at the inner side of the driving-pulley 32, or, in otherwords, between said pulley and the adjacent end of the plug-shaft, isentirely dispensed with. Besides dispensingwith a bearing at this pointfor the plugshaft an improvement is secured by providing abelt-clearance space between the pulley and the adjacent end of thejordan through which the belt may be removed when the plug andplug-shaft are withdrawn from.

the engine without cutting or unlacing the belt or without removing anyother part of the machine, as will'be presently more fully apparent fromthe novel manner of mounting the driving-pulley 32.

In regard to the mounting of the driving= pulley 32 and the portion ofthe plug-shaft 13 with which the same is directly associated it is to beobserved that the outer side member 21 of the bearing stand 20 isprovided with a central terminal bearing 33 for the extreme outer end ofthe plug-shaft atthe driven end of the latter. The said central bearing33 essentially consists of a tubular bearingbox 34, which is designed tohouse therein any approved type of antifrict-iou -bearing which willpermit of the shaft end running within the bearing box with a minimumamount of friction, while at the same time admitting of the endwise orlongitudinal adjustment thereof. In some forms of the invention thebearing-box 34 is designed to house therein a set of antifriction-rollerhearings 35 of any approved construction and preferably cooperating witha wear-bushing $36, fitting over the end of the shaft working within thebox i-l, and in the employment of antifrictiou-roller hearings 35 thesaid bearings may be conveniently held within the chamber or cavitywithin the bearing-box through the medium of a retaining-ring 37,overhanging the outer side of the bearingchamber within the box andadjustably secured -to the outer side of the box 34 through the mediumof bolts or equivalent fastenings 3S.

\Vhile antil'riction-roller bearings are usually employed in connectionwith the end of the plug-shaft turning in the bearingbox 34, it. isobvious, as already indicated. that any other form of bearing, whetherof the anti friction type or not, maybe employed for the end of theshaft without affecting the spirit of the invention. For instance, assuggested in the modifications shown in Figs. 7and ll of the drawings, abearing of the babbitted type may be utilized in connection with thebear ing-box 34. In this construction the bearingbox would he formedwith an interiorly-tapered bore 3!), receiving a correspondinglyexteriorly-tapered adjustable bearing-bushing 40. This bearing-bushingwhile held againstlongitudinal movement or displacement is designed tobe so mounted as to permil; of its rotation or circular adjustment topresent a new babbitted bearing-surface to the shaft and to againcentralize the shaft in the shell after wear of the babbitted surfaceupon which the weight of the shaft has been borne in the rotationthereof. This mounting of the adjustable bearing'bushing 40 maynecessarily be accomplished by a variety of mechanical expedients; but asimple construction is shown in Figs. 7 and 11 of the drawings andresides in the employment of an adjustable carrier-ring 41, having aninteriorly-threaded portion 41. engaging the exteriorly-threaded neck41" at the outer side or end of the bearing-box 34. The adjustablecarrier-ring 41 is also provided With an inWardly-projectingretaining-flange 42 and at its outer end carries a detachableretaining-plate 42, disposed in parallelism to the flange 42 and servingto confine in the interval therebetween the annular holding collar orflange 42", constituting a rigid part. of the bushing 40 and projectingexteriorly from the outer end portion thereof beyond the neck of thebearing-box 34.. Any suitable means may be associated with both thebushiug4O and the adjustable carrying-ring 41 to provide for the turningthereof in the adjustment of the babbitted hearing. One of theseexpedients is indicated in the drawings and consists in providing theextreme outer end portion of the bushing 40 and also the outersurface ofthe carrier-ring 41 with a plurality of tool-receiving sockets or holes42 Any suitable tool may be inserted in these sockets or holes forturning the members provided therewith.

The bearing-bushing 40 carries the inner babbitted bearing-surface 43,against which rotates the wear-bushing 36, arranged over the end of theshaft, turning Within the bearing-box 34. From theconstruction describedit will be obvious when that portion of the babbitted bearing-surfacewhich sustains the weight of the shaft becomes Worn it is only necessaryto rotate or turn the adjustable bearing-bushing 40 to provide forpresenting to the shaft a new bearing-surface. By reason of the taperedfit of the bearing-bushing 40 within the bearing-box 34 the same may beheld tightly therein by screwing up the adjustable carrying-ring 41;also, if it is desired to loosen up the bushing 40 to permit of the easyrotation or turning thereof it is only necessary to screw up thecarrier-ring 41, as will be obvious.

The construction described presents one way of providing a babbittedbearing for the end of the plug-shaft; but it is obvious that otherforms of babbitted bearings as well as other forms of plain orautifrictiou bearings may be employed in carrying out this part of theinvention A very important feature of the invention resides in themounting of the driving-pulley 32 for rot-ationin a fixed plane relativeto tho endwise or longitudinal adjustment of the plug-shaft; also, toprovide for the mounting of the pulley in such a manner that the samewill be entirely relieved from any binding pressure or thrust exertedfrom opposite sides in either direction, or, in other words, to providefor absorbing any lateral thrust imposed upon the pulley. A furtherobject in this connection is to so mount the pulley that the plug andplug-shaft may be entirely withdrawn from the engine or machine and thepulley will remain supported in an operative position, admitting of theready removal and replacing of the belt as well as of the replacing ofthe plug-shaft without the necessity of disturbing any part of thehearing-stand or its appurtenances. To accomplish these desirableresults, the driving-pnlley 32 is notonly constructed to slidablyreceive and rotate with the plug-shaft, but is designed to be mountedupon or otherwise have a swiveled connection with a fixed or stationarypart of the bearing-stand, preferably upon the bearing-box 34 or anextension of the latter.

In the broad aspect of the invention it is In the preferable forms ofthe machine the bearing-box 34 is provided at theinner side thereof withan inwardly-projecting contracted supporting hanger or collar 44, whichmay be either an integral part of the box or con-v sist of a separatecasting rigidly united thereto, as may be found most convenient ordesirable in the manufacture of the machine.

In conjunction with the supporting-collar44 'of the bearing-box the hubof the pulley,

whether ofthe web or spoked type, is provided at one side of the radialcenter of the pulley with alateral hanger member46,which looselyoverhangs the supporting-collar 44 of the.

Vide a part of the interlocking rotatable or swiveled connection betweenthe pulley and.

the fixed stationary bearing-box, but will also provide means for takingany lateral thrust of'the pulley in either direction as might beoccasioned by the thrust of the plug-shaft being communicated to thepulley during the operation of the engine. It is therefore preferable inthe mounting of the pulley to provide a hanger therefor which is of thethrustbearing type and capable of taking the said thrust of the pulleyin either direction. In other words, a double-acting orduplexthrustbearing is employed in the mounting of the pulley, and, referringto a preferred construe-- tion shown in Fig. 4 of the drawings, thedouble acting thrust bearing for the pulleymounting is shown asconsisting of a pair of loosely-mounted bearing-rings 48 and 49,respectively, which are arranged in parallel relation within thebearing-chamber or housing of the pulley-hub. One of these rings is inthe form of a cup-ring to provide a race for a circular series ofantifriction bearing-4 balls 50, and within the ,base of the cup-ring 48is preferably fitted a wear plate or ring 51, constituting a hardenedwear-surface for the balls to roll against, said other ring 49preferably being hardened to constitute the opposing wearing-surface forthe balls.

The bearing-rings 48 and 49 are mounted together upon thesupporting-collar 44 of the bearing-box at one side of anabutment-shoulder 52, formed on the said collar, and the saidbearing-rings. and the interposed balls:

50 are held in place as a complete bearing through the medium ofoverhanging retaining-rings 53 and 54, which are respectively secured tothe inner end of the supportingcollar 44 to overlap the bearing-ring 49and to the outer side of the pulley hub to overhang the bearing-ring 48,as plainlyshown in Fig. 4 of the drawings.

From the construction described itwill be obvious that according to ,thedirectioniof thrust which may be exerted laterally upon thedriving-pulley the bearing-rings 48 and 49 will become alternately fastand loose, thus permitting of a duplex or double acting thrust-bearingaction in the individual bearing for the driving-pulley.

In connection with the mounting of the pulleyin the manner describeddiametrically opposite keys or feathers 55 are securedin the hub of thepulley and project into and slidably engage with the longitudinal.keyways or grooves 56, formed in diametrically opposite sides of thedriven end of the plug-shaft. By reason of having the keys or feathers55 secured to the hub ofthepulley there are no projectionsorobstructions from the plugshaft which prevent of the ready withdrawaland replacing of the plug in its shell whenever desired or required.lhlrthermore, in the construction shownthe keys or feathers 55 may bemade removable or replaceable through the chambered side of thepulleyhubr v At this point it is to be noted that the iongitudinalkeyways or grooves 56, formed in opposite sides of the driven end of theplugshaft, not only receivethe keys or feathers 55, carried by the hubof the pulley, but also the oppositely-disposed keys or feathers 55,secured in and carried by thewear-bushing 36, surrounding the end of theshaft,-turning in the bearing within the bearingJooX 34. Theoppositely-disposed keys or feathers 55 preferably extend longitudinallythe full length of the wear-bushing 36 and are held in seats providedtherein through the medium of screws or equivalent fastening means 555-;but it will of course be understood that the keys vor feathers 55 may befitted or secured to the bushing 36 in any approved manner so long asthey provide slid-able interlocking engagement between the plugshaft andthe bushing, whereby the latter is permitted to freely rotate withtheshaft in the bearing, while at the same time permitting oflongitudinal or endwise movement of the plug-. shaft as the same may beadjusted in that direction.

In any form of the invention involving the .employment of a wear-bushingupon the driven end of the plug-shaft which turns in the bearing theremust necessarilybe a keyed or feathered connectionas, for instance, inthe babbitted form of bearing shown in Figs. 7 and 11 the wear-bushing36 is illustrated as having fitted thereto the same keys or feathers 55,just referred to. The keyed or feathered connection between the drivenend of the plug-shaft and the wear-bush'in g therefor materially assistsin holding the shaft end true within its bearing and accurately guidesthe shaft into and out of the bearing.

Many modifications may be resorted to in the thrust-bearing hanging ofthe drivingpulley. For instance, as shown in Fig. 60f the drawings,instead of having but a single ICO IIO

set of antifriction bearing-balls, as shown in Fig. 4, there may beemployed a pair of widened bearing-rings 4-8 and as), with the saidring48 having formed therein a plurality of concentric races 57, whichreceive therein a set ofantifrietion-balls 50, cooperating with theopposing bearing-ringed). This construc tion simply provides a moreextended antifriction-bearing of the same type as shown in Fig. 1. Adistinctively differentform of double-acting thrust-bearing hanger forthe driving pulley is shown in Fig. 5. This modification involves theemployment of a base bearing ring 58, secured fast upon the supportingcollar et-it of the bearingbox and provided with a circumferentialangular ball-race 59, accommodating therein a series of bearingballs 60,which also turn in the complemental angular ball-race 61,formed byadjacent beveled edges of a pair of bearing plates or rings 62 and 63,respectively. These plates or rings 62 and 63 are arranged side by side,but are separately fastened to the adjacent hanger member 46 of thepulley-hub. By reason of the angular formation of the ball-races 59 and(31 it will be obvious that the construction necessarily provides fortaking lateral thrust exerted upon the pulley in either direction, andthus accomplishing all the mechanical results of the other forms ofbearing-hangers already described.

To elfect a delicate and minute endwise or longitudinal adjustment ofthe Jordan plug and its shaft there is associated with the latter at theend opposite the driven end thereof an adjustable thrust-bearing 64.This thrustbearin'g not only provides in connection with suitableadjusting mechanism for effecting the longitudinal adjustment referredto, but also serves to absorb the thrust of the plugshaft when exertedin either direction. Any suitable type of double -acting or duplexthrust-bearing may be employed for this purpose; but a preferableconstructionis shown in the drawings, and essentially consists of abearing box or case 65, slidably mounted in a horizontal stationaryguide 66, suitably supported above the base B at one end of theplugshell. The bearingbox 65 receives therein one end of the plug-shaft13 and also provides a housing for a set of roller or equivalent antifriction bearings 67, which encircle a reduced journal portion 68 ofthe plugshaft. The said roller or antifrietion bearings 67 are usuallyheld in place by means of a retaining-collar 69, arranged at one end ofthe box 65, and at the opposite end of the latter the same has formedtherein a bearingch'amber 70, which receives the double-actingthrust-bearing proper. In the construction shown this double-actingthrust-bearing proper is substantially like the type of hearing shown inFig. ii of the drawings in connection with the pulley-mounting, andessentially consists of a pair of loosely-mounted bearing-rings 71 and72, both carrying hardened wear-plates 73, and one of said rings--namely, the ring 7lbeing in cup form to provide a race for a set ofantifriction hearing balls 74, interposed between the two rings. Thesaid rings 71 and 72 are preferably arranged on a shaft-bushing 75,fitted on the reduced terminal 76 of the plug-shaft beyond the journalportion 68 thereof. Also the said bearing-rings are designed to restagainst opposite sides of the chamber 70, within which they are located,and according to the direction of thrustof the shaft become alternatelyfast and loose to provide for easing or absorbing the thrust inwhichever direction it may be exerted. The rings constituting the doubleacting thrust bearing proper may be held vithin the bearing-chamberthrough the medium of any suitable holding devices, such as the separatesets of nut secured holding elements 76 and 77. (Shown in Fig. 5% of thedrawings.)

While many forms of adjusting devices may be associated with theplug-shaft to ac complish endwise or longitudinal adjustment thereof, animproved type of adjusting means is shown in the drawings, andessentially consists in the employment of a single adjusting-screw 78,carrying at its outer end. a hand-wheel 79, and swiveled contiguous toits outer end in a bearing-bar 80 at one end of the horizontalstationary guide 66.

-The threaded portion of the screw '78 turns in the nutSl at the outerend of a yoke 82, rigid with and offset from the outer end of thebearing box or case 65, and to accommodate the inner end portion of thescrew 78 the adjacent end of the plug-shaft is cored to provide alongitudinally-disposed pocket or axial bore 83. Thislongitudinally-disposed pocket or axial bore 83 accommodates the majorportion of the adjusting-screw, and therefore permits the pressure ofsaid screw to be exerted in a perfectly true axial line.

It is preferable .in the carrying out of the invention to associate withthe adjusting devices for tho plug-shaft fastening or locking means forsecuring the plug against endwise movement and holding the sameperfectly rigid, as far as such movement is concerned, after having oncebeen properly adjusted or set through the medium of the said adjustingdevices. A simple and practical expedient for effecting this result isillustrated in the drawings and consists in -1naking the threaded nut 81of the split typethat is, forming the same with a split portion 81, theslit of which is intersected bya threaded opening receiving alocking-screw 81, having a hand-wheel 81 at its upper end. Thelocking-screw necessarily provides means whereby the split nut 81 may betightened or bound upon the screw 78, so as to positively lock the sameagainst rotation, and hence serving to hold the plug against endwise orlongitudinal movement after having been once set. Other equivalentexpedients could of course be resorted to to accomplish the same result.

The invention also has inview associating with the adjusting devices forthe plug suitable indicator or indicating means which enables theoperator to accurately determine the exact degree of adjustment of theplug, and which is especially useful, in the event of the plug havingbeen removed, by admitting of the plug being screwed back into the shelland reset perfectly or accurately to its original position. A form ofindicator securing these advantageous functions is plainly shown inFigs. 8 and 13 of the drawings, and essentially consists of a stationarygraduated dial 85, conveniently supported in a fixed position upon theframe-guide 66 and arranged con centrically with relation to theadjustingscrew 78.. The indicator also includes a swingingpointer orindex-finger 86, carried by the screw 78 and playing over the graduatedface of the dial 85. Any equivalent arrangement of the dial and thepointer or index-finger 86 may obviously be resorted to in carrying outthis part of the invention.

It has already been pointed out that the driving-pulley 32 is not onlyconstructed to slidably receive and rotate with the plugshaft, but isalso designed to be mounted for rotation upon a fixed or stationarysupport, whereby the said pulley will rotate in a fixed plane relativeto the endwise or longitudinal adjustment of the plug-shaft. In someforms of the invention, as alreadydescribed, the mounting or hanging ofthe pulley involves the employment of an antifriction-bearing soarranged as to receive and absorb any lateral thrust of the pulley ineither direction. However, it should be understood that it is notabsolutely essential or necessary to the successful carrying out of theinvention that a bearing be employed in the mounting or hanging of thepulley. For instance, as suggested in Fig. 11 of the drawings, thefeature of an antifriction-bearing may be entirely dispensed with in themounting of the pulley and instead thereof a plain swiveled connectionutilized with suitable oilers to provide for holding the pulley forrotation in a fixed plane independent of the longitudinal adj ustment ormovement of the plug-shaft.

As indicated in Fig. 11 of the drawings, the supporting hanger orcollar-.44: at the inner side of the bearing-box 34: may be providedwith an annular hanger-ring 87, projecting from the periphery thereofand fitting in the holding-groove 47, provided in the chambered side ofthe hanger member 46 of the pulleyhub 45, one side of saidholding-groove 47 being formed by the detachable retainingplate 88,which necessarily serves to hold the pulley-hub interlocked with thehanger-ring 87, located at the inner end of the bearingbox 34:. Theconstruction described provides an interlocked hanger or swiveledconnection between the pulley-hub and the bearing-box 34, while at thesame time not interfering with the free rotation 'of the pulley with theshaft keyedtherein. Other forms of friction or antifriction hangers forthe pulley or, in fact, any kind of swiveled connection either inside oroutside of the bearing may obviously be resorted to in carrying out thispart of the invention.

Inasmuch as the herein-described machine especially exemplifies theimportance of combining with the longitudinallyadjustable plug-shaft aduplex or double-acting thrustbearing for said shaft opposite the drivenend thereof, the claims embodying that combination are made hereininstead of in my other application aforesaid.

From the foregoing it is thought that the construction, operation, andmany advantages ofthe herein-described improvements in Jordan orrefiningengines will be readily apparent to those familiar with the artwithout further description, and it will also be understood that variouschanges in the form, proportion, and minor details of construction maybe resorted to without departing from the spirit of the invention orsacrificing any of the advantages thereof.

Having thus described the invention, what is claimed, and desired to besecured byLetters Patent, is-

1. In a refining-engine of the class described, the combination with theshell, and the plug having the shaft, of a stationary support having asingle bearing, and the drivinggear-including a pulley slidablyreceiving the shaft and having an interlocked connection with thestationary'snpport for rotation in a fixed plane.

2. In a refining engine of the class described, the combination with theshell and the plug having the shaft, of a stationary support having asingle bearing, and a drivinggear including a pulley having a directfeathered connection with the shaft and also held to rotate in a fixedplane upon the stationary support, said pulley having an interlockedconnection with the latter.

3. In a refining-engine of the class described, the combination with theshell and the plug having the shaft, of a stationary support having asingle bearing, and drivinggear including a driving-pulley rotatablyinterlocked with said support and also having a feathered connectionwith the shaft.

4. In a refining-engine ofthe class de'- scribed, the combination withthe shell and the plug having the shaft, of a stationary supportarranged exterior to the shell and havingasingle bearing, and thedriving-gear including a pulley having a direct feathered connectionwith the shaft, and also an antifriction interlocked swiveled connectionwith said support. I

5. In a refiningengine of the class de-' scribed, the combination withthe shell and the plug having the shaft, of a stationarysupport arrangedexterior to the shell and having a single bearing, and thedriving-gearincluding a pulley having a thrust-bearing and having aninterlocked swiveled connection with the stationary support, and alsohaving a direct feathered connection With the shaft.

6. In a refining-engine, the combination with the shell and the plughaving the shaft, of a stationary support arranged exterior to the shelland having a single bearing, and the driving-gear including'a pulleymounted for a fixed rotation upon the stationary support and having aninterlocked connection with the latter, said interlocked connectionincluding a double-acting thrust-bearing.

7. In a refining-engine of the class described, the combination with theshell and the plug having the shaft, of a stationary support arrangedexterior to the shell and having a single bearing, and thedriving-pulley interlocked with the stationary support and carriedbysaid stationary support for rotation in a fixed plane, and having adirect feathered connection with the plug-shaft, said pulley beingarranged to permit of the complete withdrawal of the plug-shaft withoutdisturbing its mounting upon the said support.

8. In a refining-engine of the class described, the combination with theshell, and the plug having the shaft, of a stationary support arrangedexterior to the shell and having a single bearing, and the drivingpulleyhaving a lateral interlocked swiveled connection with the said supportwith a belt-clearance space between itself and the adjacent wall of theshell,said pulley also having a direct feathered connection with theplug-shaft.

9. In a refining-engine of the class described, the combination with theshell and the rotating plug having the shaft, of a stationary supportarranged beyond one end of the shell, and the driving-pulley having aside hanger memberrotatably mounted directly upon the said support, saidhanger member also carrying a thrust-bearing for the pulley and thelatter having a direct feathered connection with the plug-shaft.

10. In a refining-engine of the class described, the combination withthe shell and the rotating plug having the shaft, of a stationarysupport arranged beyond one end of the shell, a driving-pulley providedwith a hanger member and having a direct feathered connection with theplug-shaft, an antifriction-bearing for the hanger member of the pulley,and means for effecting a rotatable interlocking swiveled connectionbetween the hanger member and said stationary support through the mediumof said bearing.

11. In a refinipg-engine of the class de scribed, the combination withthe shell and the rotating plug having the shaft, of a stationarysupport arranged beyond one end of the shell and provided with asupportingcollar, and the driving-pulley having a direct featheredconnection with the shaft and provided at one side of its hub with achambered hanger member, a double-acting thrust-bearing housed Withinthe chamber of the hanger member and including the saidsupportingcollar, and retaining devices for the bearing carriedrespectively by the supporting-collar and the hanger member of thepulley.

12. In a refining-engine of the class described, the combination withthe shell and the rotating plug having the shaft, of a stationarysupport arranged beyond one end of the shell and provided with ashouldered collar, adriving-pulleyhaving a direct feathered connectionwith the plug-shaft and provided at one side with a chambered hangermember, a double-acting thrust-bearing essentially comprising a pair ofloosely-mounted rings with interposed bearing-balls, the same beingarranged within. the chamber of the hanger member and over the saidshouldered collar, and retaining-rings overhanging opposite sides of thesaid thrust-bearing and respectively secured to the hanger member of thepulley and the collar of said stationary support.

13. In a refining-engine of the class described, the combination withthe shell and the rotating plug having the shaft, said shaft beingprovided in the driven portion thereof with keyways or grooves, of astationary support arranged beyond one end of the shell, thedriving-pulley carrying keys or feathers directly engaging the keywaysof the plugshaft and provided at one side with a chambered hangermember, a double-acting thrust-bearing housed within said hanger member,and retaining devices carried respeetively by the pulley and thestationary support and cooperating with the said hearing to provide arotary interlocked connec tion between the pulley and the saidstationary support.

1%. In a refining-engine of the class described, the combination withthe shell and the rotating plug having the shaft, of a stationarysupport arranged exterior to the shell and having a bearing-boxreceiving the driven end of the plug-shaft, an antifriction-bearingwithin the bearing for said driven end of the shaft, and adriving-pulley having a direct feathered connection with the shaft andalso rotatably interlocked with the said bearingbox for rotation in afixed plane.

15. In a refining-engine of the class described the combination With theshell and the rotating plug having the shaft, of a bearing-standarranged beyond one end of the shell and provided with a singleantifrictionbearing for the extremity of the shaft at the driven endthereof, and the driving-pulley feathered directly to the shaft andhaving at one side of its radial center an antifriction interlockedswiveled connection directly upon the single bearing of thebearing-stand, said pulley providing between its opposite side and theadjacent end of the shaft a clearancespace for the belt.

16. In an engine of the class described, the combination with the shelland the rotating plug having the shaft, of a bearing-stand arranged atone end of the shell and having rigidly-connected inner and Off? sidemem- ICC bers, the inner side member-having a studing-box for theplug-shaft and the outer side member having an antifriction terminalbeari-ng forthe end of the shaft, and the drivingpulley arranged insideof the plane of the bearing-stand and mounted to rotate in a fixed planeupon the outer bearing carried by the stand, said pulley having a directfeathered connection with the plug-shaft.

17. In an engine of the class described, the combination with the shelland the plug-shaft, of the driving-pulley for the shaft, and a shiftablebelt-accommodating bearing-stand. 18. In an engine of the classdescribed, the combination with'the shell and the plug-shaft,

of the driving-pulley, and a shiftable beltaccommodating bearing-standarranged for adjustment upon a horizontal axis andhaving abelt-clearance opening adapted to be presented in the direction of thebelt-draw. 19. In an engine of the class described, the

combination with the shell, the plug-shaft and,

the driving-pulley for the shaft, of a circularly adjustable orrotatable belt-stand swiveled at one side upon the adjacent end of theshell and carryingat the opposite side a terminal antifriction-bearing'for the plug-shaft, said bearing-stand having a belt-clearance opening.

20. In an engine of the class described, the combination with the shell,the plug-shaft and the driving-pulley, of a circularly adjustable orrotatable bearing-stand arranged about the pulley and having abelt-clearance opening, said bearing-stand being provided at its innerside with the stuffing-box and having a swiveled engagement at such sidewith the adjacent endof the shell, the opposite or outer side of thebearing-stand being provided with a terminal antifriction-bearing forthe plug-shaft.

21. In an engine of the class described, the combination with the shell,the plug-shaft and the driving-pulley for the latter, of a circularlyadjustable or rotatable bearing-stand swiveled upon one end of the shelland having at the outer side thereof a single terminal bearing for theend of the shaft, said termi nal bearing constituting a supportingmember for the driving-pulley, said bearing-stand being provided with abelt-clearance-opening for accommodating the belt, 311df315l'1611'.

, bearing-stand'having a swiveled connection at one end of the shell andprovided at its outer side with the single terminal bearing 23. In anengine of theclass described, the combination with the shell, theplug-shaft and the driving-pulley for the latter, of stationarystand-seats, and a circularly adjustable or shiftable bearing-standessentially consisting of a circular skeleton framework having inner andouter side members and a plurality of cross-bars connecting said membersand constituting saddle-plates adapted to be individually fastened tosaid seats, theinner side member having a stuffing-box and beingswiveled to the shell and the outer side member having a single terminalbearing for one extremity of the plug-shaft.

24. In an engine of theclass described, the

25. In an engine of the class'described, the

combination withthe shell and the rotating plug, of the plug-shafthaving at one end alongitudinally-cored pocket, driving-gear having anoperative connection with one end of the shaft for turning the samewhile permit ting a longitudinal movement thereof, an adj ustablebearing for the opposite end of the shaft having an oifstanding yokecarrying a nut, and an adjusting-screw mounted toturn in a suitablesupport and engaging the said nut, said screw being alined with thelongitudinal axis of the shaft and extending into the said pocket of thelatter.

26. In a refining-engine of the class described, the combination withthe shell and the rotating plug having the shaft, of a sta tionarysupport arranged exterior to the shell and havinga bearing-box receivingthe driven end of the plug-shaft, a wear-bushing having a keyed orfeathered connection with the driven end of the shaft and turning withinthe bearing-box,means for adjusting the plug shaft longitudinally, and adriving-pulley rotatably interlocked with the stationary sup-V portandhaving a feathered connection with the shaft.

27. In an engine of the class described, thecombination withthe shelland the rotating plug having the shaft, of driving-gearin operativeconnection with one end of the shaft for turning the same whilepermitting a longitudinal movement thereof, an adjustable bearing forthe opposite end of the shaft, said bearing having offset therefrom ayoke member havinga split-nut element, a suitablymounted adjustingscrewengaging said nut, and a" locking-screw cooperating with thesplit nut.

28 In an engine of the class described, the

combination withthe shell and the plug hav- -;ing theshaft, ofdriving-gear inoperative con- ICC) nection with the shaft and permittinga longitudinal movement thereof, adjusting means for the shaft, and anindicator cooperating with the said adjusting means to determine the setposition of the plug.

29. In an engine of the class described, the combination'with the shelland the plug having the shaft,of driving-gear in operative connectionwith the shaft and permitting a longitudinal movement thereof, andadjusting devices for the shaft including an adjustingscrew, and anindicator comprising a dial arranged concentrically to the adjlisting-screw, and a pointer or index-finger carried by the said dial.

30. A machine of the character described comprising a shell, alongitudinally-adjustable grinding-shaft arranged therein, adriving-pulley which is slidably connected with said shaft, but held toturn therewith, a stationary bearing Within which said shaft rotates,and a swiveled connection between said pulley and bearing for holdingsaid pulley from axial movement in both directions, substantially asdescribed.

31. A machine of the character described comprising a longitudinally-adjustable grinding-shaft having an axial bore in one end, an adjustablethrust-bearing in which the bored end of said shaft is journaled, and anadj usting-screw for said hearing which is partly arranged in the boreof said shaft, substantially as described.

32. A refining-engine comprising a shell, a grinding means, and a shaftfor operating the same, means for adjusting said shaftlongitudinally,comprising an adjustable combined thrust and journalbearing in which one end of said shaft is journaled, a swiveledadjusting-screw,a threaded connection between said bearing and screw,the journaled end portion of said shaft being axially bored and saidadjustingscrew being partly located therein, the diameter of said borebeing suflicient to permit said shaft to rotate independently of saidscrew, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

MELVIN AMBROSE MILLS.

Witnesses i WALTER CoULsoN, HELEN A. SMITH.

